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Short-circuit protection
Protect the input cable and drive against short circuit according to the following
guide lines.
Distribution
board
1)
1)
Size the fuses according to local safety regulations, appropriate input voltage
and the rated current of the drive. Only gG and aR fuses are allowed, see
fuses
(page 122).
Standard gG fuses (US: CC or T for ACS800-U31) protect the input cable in short-
circuit situations, restrict drive damage and prevent damage to adjoining
equipment in case of a short circuit inside the drive.
Check that the operating time of the fuse is below 0.1 seconds. The operating time
depends on the fuse type (gG or aR), supply network impedance and the cross-
sectional area, material and length of the supply cable. In case the 0.1 seconds
operating time is exceeded with gG fuses (US: CC/T/L), ultrarapid (aR) fuses in most
cases reduce the operating time to an acceptable level. The US fuses must be of the
"non-time delay" type.
For fuse ratings, see
Note: Circuit breakers must not be used.
Circuit diagram
DRIVE DOES NOT HAVE INPUT FUSES
Input cable
Technical data
(page 119).
Planning the electrical installation 55
Drive type
ACS800-31
Drive or drive
ACS800-U31
module
~
M
~
3~
Short-circuit
protection
Protect the
drive and input
cable with
fuses. See
footnote 1).
Mains cable
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